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相关概念视频

Causality in Epidemiology01:21

Causality in Epidemiology

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Causality or causation is a fundamental concept in epidemiology, vital for understanding the relationships between various factors and health outcomes. Despite its importance, there's no single, universally accepted definition of causality within the discipline. Drawing from a systematic review, causality in epidemiology encompasses several definitions, including production, necessary and sufficient, sufficient-component, counterfactual, and probabilistic models. Each has its strengths and...
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Pulse01:16

Pulse

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When the heart pumps blood out, arterial elastic fibers play a crucial role in sustaining a high-pressure gradient. They expand to accommodate the received blood and then recoil - a process known as the pulse that can be either manually palpated or electronically quantified. Despite a reduction in its effect with increased distance from the heart, elements of the pulse's systolic and diastolic components persist, observable even at the arteriole level.
The pulse serves as a clinical...
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Pulse01:05

Pulse

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The pulse is one of the most fundamental physiological indicators of the body's cardiovascular health. It is the rhythmic expansion and contraction of the arterial walls in response to the pressure generated by the heart's pumping action.
Pulse Rate and its Significance
Pulse rate, often measured in beats per minute (bpm), reflects the heart rate (HR), which is influenced by numerous factors such as stress, physical activity, and hormonal changes. A normal resting adult pulse rate falls...
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Criteria for Causality: Bradford Hill Criteria - II01:28

Criteria for Causality: Bradford Hill Criteria - II

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The Bradford Hill criteria serve as guidelines for establishing causative links in epidemiological research. Beyond Strength, Consistency, Specificity, and Temporality, key criteria also include Biological Gradient, Plausibility, Coherence, Experiment, and Analogy. These principles assist scientists in assessing the likelihood of causation in complex biological contexts. Below is a summary of these concepts:
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Criteria for Causality: Bradford Hill Criteria - I01:30

Criteria for Causality: Bradford Hill Criteria - I

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The Bradford Hill criteria are a group of principles that provide a framework to determine a causal relationship between a specific factor and a disease. There are nine criteria that are pivotal in assessing causality in epidemiological studies. Here's a closer look at Strength, Consistency, Specificity, and Temporality criteria with definitions and examples:
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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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Real-Time fMRI Brain Mapping in Animals
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由单脉冲交联TMS/fMRI得出的因果连接地图.

Lison Bossus1, Jess Dickson1, Camille Blaine1

  • 1Center for Brain Imaging and Stimulation, Department of Psychiatry, Perelman School of Medicine, University of Pennsylvania, Philadelphia, USA.

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概括

这项研究引入了用fMRI (spTMS/fMRI) 进行图像引导的横磁刺激,以绘制因果大脑连接的地图. 该方法可靠地参与大脑电路,为理解功能网络提供了一个新的框架.

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Using Informational Connectivity to Measure the Synchronous Emergence of fMRI Multi-voxel Information Across Time
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科学领域:

  • 神经科学是一个神经科学.
  • 认知神经科学 认知神经科学
  • 脑部成像 脑部成像

背景情况:

  • 功能性大脑连接研究传统上依赖于相关联方法,如fMRI.
  • 在人类大脑中建立因果电路机制仍然是一个重大挑战.
  • 非侵入性技术缺乏确定大脑区域之间的直接因果关系的能力.

研究的目的:

  • 开发和验证一种方法,用于生成可靠的因果连接地图,使用带有功能性MRI (spTMS/fMRI) 的交联单脉冲横磁刺激.
  • 研究皮质和皮质下大脑区域的因果参与,通过准下前环皮质 (sgACC) 和底侧杏仁体 (BLA).
  • 为未来关于功能连接的研究提供一个强大的框架和公开可用的数据.

主要方法:

  • 在80多名参与者中采用间接单脉冲跨磁刺激与功能性MRI (spTMS/fMRI).
  • 在左半球利用个性化的,以连接为导向的目标进行sgACC和BLA刺激.
  • 量化TMS唤起的反应使用voxelwise事件相关的BOLD地图,并控制组级分析中的混因素.

主要成果:

  • 针对SgACC的向刺激诱导SgACC内部的反应,并调节分布的皮层和皮下区域.
  • 针对BLA的腹侧刺激在杏仁体中引起了负面的BOLD反应,并参与了广泛的下游区域.
  • 基于ROI的分析显示,sgACC和BLA向刺激之间引起的反应没有显著差异,验证了该方法的一致性.

结论:

  • 图像引导的TMS可以因果地参与分布式大脑电路,为功能连接映射提供了一个强大的新框架.
  • 该研究成功验证了spTMS/fMRI作为确定因果大脑电路机制的可靠方法.
  • 公共可用的因果连接地图是未来神经科学研究的宝贵资源.